﻿using System;
using System.Data;
using System.Configuration;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Text;
using System.Security.Cryptography;

namespace TMDT_Nhom1A.utils
{
    public class GenerateUtil
    {
        public static string CreateSessionID(string input)
        {
            // Use input string to calculate MD5 hash
            MD5 md5 = System.Security.Cryptography.MD5.Create();
            byte[] inputBytes = System.Text.Encoding.ASCII.GetBytes(input);
            byte[] hashBytes = md5.ComputeHash(inputBytes);

            // Convert the byte array to hexadecimal string
            StringBuilder sb = new StringBuilder();
            for (int i = 0; i < hashBytes.Length; i++)
            {
                sb.Append(hashBytes[i].ToString("x2"));
                // To force the hex string to lower-case letters instead of
                // upper-case, use he following line instead:
                // sb.Append(hashBytes[i].ToString("x2")); 
            }
            return sb.ToString();
        }

        public static string GenerateValidationCode(int rowIndex)
        {
            string s = "ORDCP";
            Random numberRandom = new Random();
            char[] charArr = "abcdefghijklmnopqrstuvwxyz".ToCharArray();

            for (int i = 0; i < 3; i++)
            {
                s = s + charArr[numberRandom.Next(26)].ToString() + numberRandom.Next(10).ToString();
            }

            if (rowIndex == 0)
                rowIndex += 1;
            s += rowIndex.ToString();
            return s;
        }
    }
}
